Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb462a3751ccd6f6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 11:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f282db82108f0c0aac4e6ea040c92ab SHA-1: dfebfcdd1d0087735c149d14081b0000e555464e SHA-256: bb462a3751ccd6f650216cf1ece739537079f23d9a356a6eb851318ac8109795
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest a phishing or credential harvesting attempt, fitting the Spearphishing Attachment (T1566.001) initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ideylia.fr/uploads/file/kifomofekomuviv.pdf In PDF document text
    • http://celeb.huh.hu/UserFiles/File/57802270569.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/buzuxumefumiba.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/87145108674.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/61842978694.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/93482603966.pdfIn PDF document text
    • https://0900107678.com/upload/file/80445894497.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/bejeroxoku.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614333a8da5e7---kikomezuluzaxo.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210924_657F19E34E70D552.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/449412cfc4a6f166c190942ef08f8b60/xogapovemilep.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/koloderuxa.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/xixupekilolusetupizuga.pdfIn PDF document text
    • http://kammed.com/userfiles/file/kenex.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/vebodejewixefabuwaz.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/88007053203.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/rugipowojadofa.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/3568931753.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109140255161988.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/vaxigefariparatuxeju.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/gulokonisu.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/daxegepelorobadavewobabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+mario+kart+64+romPDF link annotation
    • https://lapdonline.org/file/41107037548.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 10536 bytes
SHA-256: 4098bc01c05f3cde76061c59b703b1fb4a2c8eaabc722cd6400abce39810d9f8
font_01_sfnt_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 16960 bytes
SHA-256: a65eae1003b05b20e1c129f4c62c204898c50ac383ef78b0ef0fd4ec4b168e22
font_02_sfnt_off0001230a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1